Pure deadpan comedy when you talked about ordering the $20 transformer. The look on your face was priceless lol
@1834RestorationHouse
10 ай бұрын
In 40 years of working with electronics, this is the first time I've ever seen a failed ceramic cap. Nice work!
@visitslovenija
9 ай бұрын
Hi. I really enjoyed watching your video - my first time on your channel. It is nice you have the presence to let us see the whole you and not just some disembodied hands! And to see an honest process in the repair, good and bad. Heck, we all know it seldom goes smoothly. Well done.
@dont-want-no-wrench
10 ай бұрын
btw, if you get something like that you can't/decide not to fix, dont take it to the recycle, offer it up to someone else
@VB-bk1lh
10 ай бұрын
Most of those were made by Technics. They were decent receivers sold by J.C. Penney. Those wee rated at 33 watts per channel RMS. Which would have put it in the middle of the pack for MCS in 1979. They were likely similar to the SA-300 Technics receiver from the prior year or two. You'll often find that many 'house' brands like that are simply older model, rebadged, sometimes slightly redesigned models built buy one of the major Japanese manufacturers. Sometimes the are just last years model from a different market set us for US sale too.
@mdzacharias
10 ай бұрын
The MCS receivera were not made by Technics. The cassette decks and turntables were. The Japanese built ones were NEC, the Taiwanese built ones - who cares, they were garbage.
@VB-bk1lh
10 ай бұрын
All the one's I've come across were flat out Technics rebadges. I've got 9 of them here. A few were NEC but not many. From what I've seen only the top of the line models were NEC. In the 70's, nearly all the Technics and Panasonic receivers were still made in Japan. The 3233 was from 1978-79. I have one here. The 3275 was built by NEC, as was the next two models above that. Take a look at the amp modules in a Technics, a Nad 7080, and the MCS 3275. In 1980 I bought a complete system from JCP, (they were closing the local store and had a killer sale). The amp is a 3835, with matching 3700 tuner, the TT a 6502, the speakers are 683-8227, Cassette deck is a 3562. I went back a week later and bought a 3865 as well. Each component has a direct matching Technics model. The boards in the 3837 and 3862 both have Matsushita right on them, the TT is a Technics SL, the cassette is a blatant rebadge. On the amp, the Technics came with a few more options, but on the MSC, that area has a plastic plate over it, sort of a filler plug. Sound wise, its decent, on par with any other mid range equipment back then. I did a full recap on both the amps and the speakers a few years ago and it brought them back to their original quality or maybe even better. I'm sure my ears aren't the same as they were when these were new. A buddy has a 3125, which is made by NEC, that model was rated at 125wpc. I pretty much have always figured that the part number denoted the manufacturer, as the 3275 was a very different model both in output and design. The 3125 was a piece of art inside compared to the more generic looking 32XX models which were often hard to tell apart from a Sanyo or Fisher of that era on the inside.
@danielknepper6884
10 ай бұрын
@@mdzachariasyup, it gets old hearing that Technics made the receivers just like it gets old hearing pioneer built realistic
@EsotericArctos
10 ай бұрын
It definitely doesn't look like a Technics design inside. It loosk more like a rip off of a Pioneer design. Very little of this receiver looks like Technics. Now I admit to not knowing the MCS brand or JC Penny as we don't have either in Australia, but I have seen a lot of Technics equipment.
@scotttait2197
10 ай бұрын
Matsushita is Panasonic (who use Tekunikusu "technics" for their audio , so you are indeed correct
@Winterfell1066
10 ай бұрын
Like many here, I have a soft spot in my heart for MCS components. My first real "Hi Fi" system was a complete MCS system from the back of the JC Penny catalog for about $269 in 1978 or 1979. I got it for Christmas and it was still a lot of money for my parents. I can't remember all of the model numbers, but it had a 15 WPC receiver, Dolby cassette deck, a Technics made turntable (one of the best parts), and some sort of kabuki speakers that were just ok. However, at the time I thought it was FANTASTIC, Glad you are keeping MCS alive. No, it isn't Pioneer or Marantz, but it was still magic to me.
@boredwithusernames
17 күн бұрын
Just fyi here, the "rumble" and "scratch" filter on these old amps were filters designed to remove the rumble of the turntable coming up through the tone-arm when playing those old records that we used to have, the scratch filter was designed to get rid of the "tick" sounds coming through the speakers when those old records were... well... scratched 😉 Great video, thoroughly enjoyed it. 👍
@hlebo
10 ай бұрын
An excellent video about a problem unit. However, I hope you don't think that completing the "the little things" isn't worthy of another video; it would be great to see it all come together!
@NCislander
10 ай бұрын
I enjoy watching you hammer through so many possibilities on troubleshooting. How to know when to give up is always a fine line. Maybe sometimes just the challenge of figuring it out. Nice work.
@waynecummings5021
9 ай бұрын
Figuring it out IS the pleasure. No stone unturned.
@daShare
10 ай бұрын
I've seen a few ceramics go shorted like that. Always replace all even if just one is bad. Also had larger ones across the secondary go dead short with no visible damage at all. Not common, but often enough to make me check early on the the process these days. The transformer was likely damaged by someone fitting a much higher value fuse after it blew the first time.
@therealromster
9 ай бұрын
Yep I've had a few amplifiers have dead ceramic capacitors over the years too.
@KYoss68
10 ай бұрын
My Dad bought a complete MCS system in the 70's from JCPenney and I still have the turntable. As a boy I remember being amazed at all the cool features it had. I hope you get it back in good shape and give it a new life. These systems really were high end audio hidden behind JCPenney's house brand.
@jimhines5145
10 ай бұрын
I had many MCS components when I was young. Technics indeed made all their turntables. The platters even have the Technics logo on the bottom side. JCP sourced these things through a few different manufacturers. NEC, Technics and Pioneer I believe, depending on the model and year. They even had some seriously hi powered hi-end models as well. Great video! I am sure this model will sound great once you get the pots all cleaned up.
@danielknepper6884
10 ай бұрын
NEC made the majority of the receivers
@dannydougin3925
10 ай бұрын
I had a few MCS components. This host sure is handsome.
@pablov1973
10 ай бұрын
The "scratch filter" must be a 10 khz 12dB per octave filter. It was very common on 70s/early 80s amplifier and receivers. Used for filter clicks and crackle from not exactly new vinyl records.
@ripmcmanus773
10 ай бұрын
I really enjoy your videos and would actually love to see a follow-up on this one, with all the little details taken care of. Thanks!
@JamesE707
9 ай бұрын
Well done on nailing that cap! It's worth re-capping the whole power supply, which I guess you will do.
@MrDoneboy
10 ай бұрын
I like your electronics knowledge, and your spirit for not giving up too easy. As an electronics enthusiast for nearly 50 years, I'm happy that the trade is in good hands for the future!
@larryh8072
10 ай бұрын
That’s an extremely rare find. Disc capacitors are the most reliable of all capacitors and really almost never short. I can’t remember if I’ve ever seen one shorted or not. The find of the transformer was a lucky one for sure. It was great to see this get repaired. I wouldn’t have made it that far with a shorted power transformer. That would have been it for me.
@andygozzo72
9 ай бұрын
yep, ceramic failures arent common and its mostly in high voltage circuitry,
@kenmore01
9 ай бұрын
Very unusual. I'd say it got physically damaged once, and then arced and got worse.
@andygozzo72
9 ай бұрын
@@kenmore01 an unusually high voltage spike on the mains could've caused breakdown
@kenmore01
9 ай бұрын
@@andygozzo72 yes, but it would have had to be a very high surge, since it was on the secondary of the transformer and I'm thinking the voltage peak on it normally would be around 50V. That cap would have at the least a 500V rating.
@andygozzo72
9 ай бұрын
@@kenmore01 a cap on low voltage secondary very unlikely to have a high voltage rating, i've never yet seen one in that sort of position have a high rating, usually 50 to 100v, depending on the ac from the secondary
@trurllemowski4432
10 ай бұрын
Normally you shold start from power supply. But I understand that in such a situation the video would be too short... Either way, you've succeeded. Congratulations.
@g.fortin3228
10 ай бұрын
Great job man.. it's not the unit that matters here, it's the lesson ! Thanks for making this vid :- )
@handsomemann1
10 ай бұрын
Wow! You managed to discover it was transformer was faulty and lucky enough to find one at ebay for a good cheap price. And found the other fault and got it working. Very cleaver. Look forward to seeing you clean it and put lights and fix knobs and Dexoit. Will be a good amp when it is completed. Always enjoy watching your videos. Catch you soon.
@donmoore7785
10 ай бұрын
Low filter and scratch filter are used for phono - you are showing your youth.
@thefreestylefrEaK
10 ай бұрын
Respect for bringing an otherwise discarded and unappreciated ancient relic back to life. You're a saviour!
@biggie9817
10 ай бұрын
I've seen another video where they carefully pulled the xfmr apart and found a thermal protection (thermistor I think) that failed open. They wound up pulling that out and bypassing it. It is obviously not that same failure as yours but a good thing to keep in mind if you ever have an open condition. A 1 cent cap, takes out a $20 xfmr. It may have been a big surge popping that cap or maybe a lightening strike. No xrmr protection, and thus the failure of that winding.
@drewbjorke9839
10 ай бұрын
I bought this same model at a flea market years ago. Cleaned it up, did some recapping in the power supply. Very surprised! It sounds just fine, will drive any speakers and it is cool looking. It is a nice piece.
@waterjoe2024
10 ай бұрын
In 1980 I was making products for Jc Penny. They needed cheap cost. Our factory provided garbage. What a perfect match was.
@jacobrodgers2700
7 ай бұрын
I just encountered the same shorted ceramic cap issue in a Kenwood receiver, also located at the rectifier. Visually burnt and shorted. Replaced the cap and it started working again. Thankfully the transformer was okay!
@jan_phd
10 ай бұрын
One of my receivers is a Sansui 9090B Love it. Rebuilt and calibrated, about 4 years ago.
@apollorobb
10 ай бұрын
Matsushita made. basically a Panasonic . I work on quite a few of those. MCS are one of my favorite rcvrs . I usually get rid if the speaker fuses and install a relay style protection board .
@danielknepper6884
10 ай бұрын
NEC
@rfburns5601
10 ай бұрын
When I saw this, I was thinking, "yeah, that 10 volt zener diode on the amp board is shorted". But apparently lightning struck and popped the disc cap on the rectifier. (They put those across the diodes to stop switching noise on AM broadcast band.) Then the goobers put bigger fuses in til the transformer popped, or possibly the lightning strike shorted the transformer primary and the disc cap at the same time. These units were made by Matsushita for JC Penny. My sister had one. They're entry level hifi. If you put properly sized speakers and properly sized fuses in them they'll work OK and not pop your speakers. My sister's reciever would cause the cones of the woofers to pull in sharply with a loud "wump" when you turned it on. I always wondered if the speakers were gonna pop, but hey never did. It worked for many years. Then finally, it failed. A 10 volt zener on the power amp board shorted. When you turned it on, there was the loud "wump" and heavy 120 hertz sawtooth hum from the rectifiers. If you had left in on for more than a couple of seconds, it would have blown the speaker fuses.
@mjg263
10 ай бұрын
A shorted ceramic, in all these years I don’t think I’ve ever seen that one. Great find!
@joanfrellburg4901
10 ай бұрын
Love your perseverance, and logical approach. A learning experience for me, much appreciated. ❤.
@collinwood60
10 ай бұрын
Great detective work. Always amazed that a defective part the size of a dime can disable a component, or at least make it sound bad. Good to see you back doing the Hi-Fi repair videos. Let's see the rest of the MCS 3233 repairs!
@AHFixIt
10 ай бұрын
Thanks! I was just working on a bigger issue with it last night and tracked it down to another failed capacitor.
@mandymoo7406
10 ай бұрын
That was really enjoyable viewing,ive taught myself most things and was totally on the journey with you but unless i had seen the burnt ceramic disc i would have failed
@welderfixer
10 ай бұрын
Great save on this receiver. It could make a young man/lady very happy as the owner of a vintage music machine. I hope more "kids" get interested in the "hands on" kind of hobbies and work. We really need trades people who started learning their careers at a young age.
@zulumax1
10 ай бұрын
Some transformers have a thermal fuse inside the outer shell, but if that was the issue the light would not light up at all. If the transformer overheats they open the primary winding. Thanks for sharing this receiver with us, it was much enjoyed.
@terrym1065
10 ай бұрын
Nice job Aidan👍👍 A bit more elbow grease and this receiver will be ready for a price tag, somebody will love to have it. Being a department store brand doesn't necessarily make it a low quality item, it was just a re-branded secondary product line from a major mfg. like Panasonic. It'll look good cleaned up some. Thanks for the video. See ya next time.
@GTI1dasOriginal
10 ай бұрын
What you've got there is a "generic brand" built by Foster Electronics, in Japan, late 70's (1978 / 1979) Which is a subdivision of Matsushita. Ignore if anything on the device states another country of origin, this is where it was manufactured. It was common that many (european) brands let them put "of the shelf" components together, using their own faceplates and voila. (In this case) A new budget brand was suddenly born. There. Now you know. Surprised you don't know this, It's quite common knowledge....
@danielknepper6884
10 ай бұрын
Fake news NEC built these
@GTI1dasOriginal
10 ай бұрын
@@danielknepper6884you have no idea.....
@rchydrozz751
9 ай бұрын
I have one of these up in my closet I bought back in the late 70's. It was great for the time.
@englishrupe01
9 ай бұрын
Love it.....great troubleshooting. Thanks for taking us along. Nice one.
@danmartin8806
5 ай бұрын
very well done. I enjoy learning from you. Keep em coming
@saarike
10 ай бұрын
Great repair and nice device!!!! Thanks for great vid.
@ClaNan
9 ай бұрын
I had an MCS unit in the early 80’s. I think it was the same as this one. I thought it sounded great for its time. Wish I still had it.
@Keepee66
10 ай бұрын
Great job sourcing the issue(s) and resolving the the matter at hand! This was a very informative and entertaining. You know the usual. Thank-you and have a great Canadian Thanksgiving weekend! I know I will. L💞ve from Canada.
@4211Rob
10 ай бұрын
Excellent job and love seeing deductive reasoning at work. I’ve got a Pioneer receiver and the infamous Sansui Quad to work on and thanks to you I may have a better chance of success. I wonder if a film cap has a better survival rate than a ceramic cap.
@B.Wildered
9 ай бұрын
Thanks for doing this video; glad you turned me on to DG Wojo .
@clifffton
10 ай бұрын
I still have a Technics AM/FM tuner with MCS badging. It is still working. Got it at the Penny's Outlet in Columbus Ohio (RIP)
@MrElectrowhiz
10 ай бұрын
When I worked at an electronic store in 1973, the audio tech was authorized to service J.C. Penney stuff. Many of the products had a fault right out of the box. Many things either failed to work or failed within the first few hours of use. The actual MCS line came around a little later.
@bobsbarnworkshop
10 ай бұрын
Wow! I had that receiver back in the 70’s! I believe it came from JC Penny’s I purchased with a pair of Panasonic 8” Thruster speakers, an MCS dual cassette recorder and turntable! I still have the speakers and cassette deck…. I don’t remember what happened to the rest!
@bobsbarnworkshop
10 ай бұрын
Oh yeah, I retired mine because every pot and switch got very noisy! But it played for many years!
@partylee007
10 ай бұрын
Seeing that thing takes me back to when I was a teenager. My friend had a brand new one was a little bit earlier model than that with a turntable and some advent speakers. It really did sound pretty good.
@Ricoh-ho1gn
Ай бұрын
Mate love this channel. I know it's not ElectroBOOM, but I watch with nervousness when I can see the mains lead in and the DBT on and you snipping primary wires etc. Please take care, with your distraction from recording etc.!
@therealromster
9 ай бұрын
Yep I've had a few amplifiers have dead ceramic capacitors over the years too. First thing I do is a visual inspection for anything obviously burnt, second step is diode test bridge rectifiers, power rails and outputs for shorts. Megohm test the transformer primary to ground and mains lead ground resistance if it has that. One amplifier had me stumped for a little while, everything looked good but it would draw to much power when on, turns out the soldering was really bad and the center tap of the transformer was open, this burned out and open circuited the bias transistor that i failed to measure as it was hiding in the heat sink.
@spacemissing
10 ай бұрын
My immediate reaction to its styling was "Optonica" (made by Sharp), but Panasonic made some that looked similar.
@almandog
10 ай бұрын
Awesome troubleshooting. I like your procedure and your Jazz music.
@rickeymh
9 ай бұрын
I remember these audio components from the 70's. They were on the low tier, lower than Radio Shack's Optima line. The thin sheetmetal and MDF cabinet construction coupled with the sloppy PCB and wiring layout, assured that these were the lowest of the low.
@EsotericArctos
10 ай бұрын
Resistance was going up because your meter was charging the filter capacitors in circuit. That's the risk of measuring things in circuit. The negative ohms was likely due to some charge on the capacitors also. I am not sure why they designed this with the caps across the diodes of the bridge rectifier. Maybe some kind of noise filtering, but I don't think it's the best design. Good that you saved this amp from landfill, though I am not sure it was worth the cost of a new power transformer. Nice for a video though.
@Jonathan_Doe_
9 ай бұрын
They’re snubbers to reduce ripple from the diodes, pointless if you run enough filtering after the diodes.
@baronistheone
6 ай бұрын
I would guess a lightning strike took out the transformer and that cap. You might want to look into purchasing a variac (variable autotransformer) and add an inline ac current meter if it does not have one (replace that light bulb setup). Safer for you and the equipment you are working on by isolating you from line voltage as well as providing a variable AC supply to bring these things up with. For checking an output section put your DC meter across one of the output emitter resistors (checking the bias current) while you bring up some "unknown" receiver / amp and not risk blowing up more stuff. By watching the AC current meter, you can always see what is happening prior to smoke and or destroying other components. (I worked on this stuff for 30 years or so and would never touch a receiver or amp without a variac. Sencore made a variable AC supply PR57 (which I still have...) but it is limited to 4A so not for the really big power amps. It looks like you can pick up an inexpensive chinese 20A variac for a bit over $60.
@kthwkr
9 ай бұрын
It's negative MOhms because there is still some charge on the cap. Electrolytic caps are the culprits most of the time for me. The plates of the cap will collapse and touch and create a short unless they have voltage on them. Unplugging a device and sitting it on a shelf for a few years will very commonly kill those electrolytics. Most of my equipment that I rarely use is kept turned ON all the time. I have several amps from 1980 that have not been turned OFF (except for power company outages) since 1980. They still work just fine. Other gear that I left unpowered for about 10 years all have bad caps. The devices like my guitar amps that generate lots of heat when ON are on a lamp timer and power is applied for 30 minutes every day.
@tripplebeards3427
4 ай бұрын
Brainiac work!!! I'm trying to find some "output" resistors for an old Scott 1968 stereo we've had since new. Zero sound out the speakers. Had someone test it and said 2 of the resistors tested bad. Can't find them to save mylife. Part number says Bend QP-11 0689D. Can't find a cross reference for the T03 style resistors. My receiver will light up when I spin the radio dial to a station but zero sound comming out of the speakers. I worked fine up till a few years ago and then went silent
@paulstubbs7678
10 ай бұрын
Lucky man, finding that transformer, a lot easier than rewinding the original.
@kennethiman2691
10 ай бұрын
I have one. Exceptional sound. Never scrap. Knobs, faceplate and other parts have value. Tell us how it sounds. I like mine . 0:01
@jimnjele.bean-dayone3505
10 ай бұрын
Great job sir !! Would love to see it all lit and functioning.
@Electrondivize
10 ай бұрын
Hey good work on finding that ceramic discs are one of the most unsuspecting components to be shorted and often are overlooked because they are not known to short very often.
@jeremiahchamberlin4499
10 ай бұрын
A ‘scratch filter’ was to help your LPs sound a bit better.
@thechuckster1971
10 ай бұрын
Great to see that with the popularity of the vintage market that there are young guys that are interested in fixing them. It might be your hobby now but you will be getting bombarded with service work and you will be able to name your price. So much so that you will be able to make a very livable wage from a “hobby”. I have a Sansui 800 and I’m in driving distance of you so maybe I can coax you into re capping it for me. Well it’s a little drive to your location but I will do it if you will work on it. You can film it for your channel even. Tampa is close to you, right?
@johnmarchington3146
9 ай бұрын
Well done. That ceramic cap was probably poorly manufactured and it took the transformer out when the associated winding was effectively shorted out.
@andygozzo72
9 ай бұрын
ceramic caps dont go bad often but its almost always complete short or nearly short, rarely open or low capacity , they fail more likely in high voltage circuitry line line output stages or switch mode power supplies
@VikasGupta-bx5qv
10 ай бұрын
Scratch filter is for phono to reduce scratching sounds from vinyl.
@Killerspieler0815
9 ай бұрын
@AH-Fix-It - Despite me having far less experience in this than you do, my first thought was "Power Supply" (transistors/capaciors/diodes/transformers or a loose screw got stuck) as this bulb lighted up and you said this is a bad sign & I do visual inspection + a sniff test (for burning etc) before touching anything (OK the sniff test might not work so great if the device comes from heavy smokers) ... OK I don't do radio receiver + amplifier maintenence, but in my free time I change defective computer components and my fist look is always on the sticker of the power supply if the PC is not a big name brand ( = supecting a cheap one thet might kill stuff or is just defect, because users to often by the cheapest) and testing it ... followed by the grafics card (due to it´s value) if it´s a gaming PC
@andymouse
10 ай бұрын
Wow very lucky to find the transformer normaly thats game over for the old stuff. Those ceramics across the diodes are there for extra filtering like high frequency transients and stuff probably put there because of poor filtering later on!! because ceramics are cheap electrolytic caps are not. Personally I think they are not rated to be there and hence a very unusual failure, you just don't see those little guy's freak out like that but you got a great deal on the transformer, however I wouldn't spend any more money on it ! not worth it. Great video...cheers.
@williamhiles7404
9 ай бұрын
MCS were sold at JCP. Their turntables were made by Technics. Looks like it has Main/In Pre/Out jacks for an equalizer. LedHed Pb 207.20 🎶 🎸 🎹
@bondjovi4595
10 ай бұрын
I have a similar unit. It's Audiovox, or Sound Design (don't remember what it was.) I couldn't find a transformer for it. Instead of plugging it into the wall, I just run it off 14v DC. Easy enough to find a power adapter.
@Viethal369
10 ай бұрын
Fascinating work. Great job.
@tomj4506
10 ай бұрын
Well done ! VERY rare problem, in the day I would have hired you. LFOD !
@Earcandy73
10 ай бұрын
MCS wasn’t too bad. Of all the department stores, JC Penney cared about the quality of their products. The scratch filter switch is a high filter to reduce pops from scratches in records. The matrix switch turns on the matrix quad decoder.
@erikdenhouter
10 ай бұрын
These ceramic caps are rated about 63V, one mains peak and the next one goes. I would definitely replace all four with 100V types. Cost you two dollars.
@mmorrison6775
10 ай бұрын
you did good getting it working with replacement trans good job
@johny5isdead2day
9 ай бұрын
Some were made by Technics, some were Hitachi. Were great for the budget hifi or starters for the teenage crowd.
@tedrobinson372
9 ай бұрын
A scratch filter is a low pass filter to eliminate record scratch or noise.
@collinwood60
10 ай бұрын
Thanks!
@crashbot01
4 ай бұрын
This is great I found you of these at thrift shop for $10. Please share the service manual.
@JamesE707
9 ай бұрын
First half of your video .... As a quick test, you could have unwired the transformer (as you did) then apply a signal generator say at 5v rms at 60Hz to the primary, and observe the various outputs either with a scope or with a meter. Just a thought. ;o) Now, I'm watching the second half of this video ....
@kittyfanatic1980
10 ай бұрын
MCS was manufactured by matsushita industrial components ltd. AKA Panasonic. Some MAY have been rebadged pioneer not sure. Just as Sears’s house brand Lxi was manufactured by Sanyo. Normally but with sears the first three numbers before the . Is the manufacturer number. MCS though all I’ve ever seen are rebadged matsushita. You’ll know if the triangle is like a recycling logo. Not to be confused with Mitsubishi.
@robertballard8833
10 ай бұрын
Yep - late 70s with early 70s components in many cases. Atonly 33 WPC, it may not need big heat syncs.They sounded pretty good.
@agostinodibella9939
10 ай бұрын
Great diagnostic video! Did you replace the other 3 caps on the rectifier diodes so they don’t suffer a similar fate and kill the new transformer?
@jeffreyyoung4104
10 ай бұрын
Normally I would not spend the time with component audio equipment, unless it had something of value to push it into the repairable pile. In this case, finding the transformer for $20 or so would have made it happen! The shorted ceramic is more common than some people know! and poly caps are better replacements than ceramic or silver mica. Great job, and great find on the ceramic cap!
@martinda7446
10 ай бұрын
Surprised to hear you say the shorted ceramic was more common..In 50 years I can't recall having seen one! There probably have been dozens.. I just can't remember one. It certainly would not have been the first thing I looked at. I would have assumed the diode and scratched my head.
@jeffreyyoung4104
10 ай бұрын
@@martinda7446 There was a ceramic cap problem 30+ years ago with King radio corp. where the 16 volt ceramic caps were failing at an alarming rate. Their cure was to replace every ceramic cap in the radios, based on the color of the caps, from red to green. In my 36 years repairing aircraft electronics, that was the worst case of ceramic cap failure I ever saw! But it wasn't the only case of ceramic caps going bad.
@jeffaulik3980
10 ай бұрын
A 5 cent part takes this thing out. Never seen a ceramic cap go bad.
@pglick123
10 ай бұрын
When measuring resistance, the indication of negative ohms is the result of latent voltages in the power supply in the opposite polarity of your meter (the way it measures resistance). In theory, you should have checked for voltage there before measuring the resistance... Next time.
@bobgrob4
10 ай бұрын
glad you saved it.
@louoldschool7047
6 ай бұрын
good job as always
@-Troll-
10 ай бұрын
That was my first thought too. "Kenwood". 🤣
@josbouten
9 ай бұрын
The DC resistance value you measured for the 'bad' transformer was 0 Ohm, which was kinda low, but then again for a 'high' power output of a transformer a low DC resistance is to be expected and maybe the meter can not reliably measure very low resistance values. The 'good' transformer showed only a slightly higher value of 0.4 Ohm. Are you sure the 'bad' transformer is broken / shorted? What happens when you apply some voltage to it and measure the AC output of that secondary winding? If there is no voltage, then for sure it is shorted, if there is, then maybe that bad capacitor was all there was wrong. Note, it can sometimes be helpful to measure the inductance of a suspicious winding next to or in stead of its DC resistance.
@geraldhaggard1018
9 ай бұрын
I normally don't have bridge rectifier diodes paralleled by capacitors their purpose is for noise reduction on the power lines, would be better to replace them all than just one. Just my opinion.
@lionelcampos9868
9 ай бұрын
Great job
@kevinanderson7613
10 ай бұрын
I vote for another video to see it all cleaned up and working at full strength
@jimchandler6744
9 ай бұрын
To answer the presenters question, a scratch filter removes some if not all of the noise from scratched vinyl or tapes.
@larryshaver3568
10 ай бұрын
a scratch filter trims off some of the highs when listening to old records or tapes
@kthwkr
9 ай бұрын
From the glimpse of that blown fuse it looked like a blown slow blow. Perhaps the problem is it was too slow and the xfmr melted inside. I'm still watching. Hope you dissect that xfmr.
@reinkansman1081
10 ай бұрын
Nice to be able to step back if what we expect is not the right path, especially in unfamiliar territory.
@RedSinter
10 ай бұрын
So, given that you've rectified, pun intended, the issues...are you going to correct that design issue with DC Coupled Amplifier and put in a blow out circuit? And seeing it finished and demoed would be sweet. I don't think it needs it's own show, but as an addition to something else you are dealing with.
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